In modern industrial applications, the accuracy of mechanical scales is affected by a variety of environmental factors, among which temperature fluctuations, vibration interference, humidity changes and electromagnetic interference are the main influencing factors. In response to these problems, engineers have significantly improved the performance and reliability of mechanical scales through a series of advanced designs and material selections.

The impact of temperature fluctuations on the accuracy of mechanical scales is mainly due to the thermal expansion and contraction effect of materials. When the ambient temperature deviates from the standard working conditions, the metal structure of the scale body will undergo microscopic deformation, resulting in changes in the contact gap between the knife bearing and the knife. Experimental results show that for every 5°C change in temperature, the deformation of the rigid structure of the scale body can reach 0.02mm. This tiny change is enough to cause the sensitivity of the metering lever to decrease by 0.3%. In order to solve this problem, a double-layer insulation structure is used in engineering practice. By coating the surface of the scale body with high-temperature resistant paint and filling the interior with insulation materials, the temperature gradient is effectively controlled within the range of ±2°C. In addition, key components such as knives and knife bearings are made of high-stability alloy steel, whose thermal expansion coefficient is only 1/3 of that of ordinary carbon steel, which effectively suppresses drift caused by temperature changes.

Vibration interference is another important factor affecting the accuracy of mechanical scales. In the heavy machinery operation area, the ground vibration frequency can be as high as 10-50Hz. This low-frequency vibration will be transmitted to the metering lever through the scale structure, causing the reading to fluctuate. To this end, engineers designed a triple vibration reduction system: a rubber vibration reduction pad is set on the base layer to increase the vibration attenuation rate to 85%; the scale support adopts an air spring structure to achieve dynamic balance through air pressure regulation; a damping device is added to the metering lever system to shorten the vibration response time to less than 0.5 seconds. This composite vibration reduction system significantly improves the accuracy and stability of the mechanical scale in a vibrating environment by 40%.

Humidity changes also have a profound impact on the performance of mechanical scales, mainly in the effectiveness of the lubrication system and the corrosiveness of the material. In a high humidity environment, the oxidation failure rate of grease is accelerated, resulting in a significant increase in the friction coefficient between the knife and the knife bearing. Research data shows that when the relative humidity exceeds 85%, the repeatability error of the mechanical scale will expand from ±0.1% to ±0.3%. To meet this challenge, the engineering team developed a moisture-proof sealing structure, added a labyrinth seal ring to the blade bearing, and combined with vacuum drying technology to control the internal humidity below 40%RH. At the same time, the key friction surface uses a solid lubricant coating, which has five times the wear resistance of traditional grease, effectively extending the maintenance cycle of the equipment.

Electromagnetic interference is also a factor that cannot be ignored in modern industrial environments. The pulse magnetic field generated by equipment such as frequency converters and electric welders can induce eddy currents in the metal structure of the mechanical scale, resulting in abnormal readings. For this reason, a double shielding design is adopted in engineering practice: the outside of the scale body is wrapped with a high magnetic permeability alloy plate, which can attenuate the external magnetic field strength by 90%; the internal signal line adopts a twisted pair structure, combined with a metal braided mesh shielding layer, to attenuate the electromagnetic interference signal to the microvolt level. This electromagnetic protection system enables the measurement stability of the mechanical scale to reach ±0.05% in a strong electromagnetic environment.